Size of the image

Hi,
  Starting playing with Croquet, I've created a new version of the
actual official image to play a bit and its size has grown very quickly
(about 2 or 3 times bigger). I don't really understand why, I've just
created some new classes to define my own islands and I believe that the
objects created are well destroyed. Is there a way to discover what
takes so much memory in the image ? (dead objects, ...)


Thanks,
 Jérôme